clocksource: revert: use init_timer_deferrable for clocksource_watchdog

clocksource: revert: use init_timer_deferrable for clocksource_watchdog

Revert

commit c6c44aa74bed47300fd7aca6a518e59051ba9aed
Author: Parag Warudkar <parag.warudkar@gmail.com>
Date:   Wed Jan 30 13:30:01 2008 +0100

    clocksource.c: use init_timer_deferrable for clocksource_watchdog

    clocksource_watchdog can use a deferrable timer - reduces wakeups from
    idle per second.

The watchdog timer needs to run with the specified interval. Otherwise
it will miss the possible wrap of the watchdog clocksource.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org